When plotting a plot using matplotlib:

  1. How to remove the box of the legend?
  2. How to change the color of the border of the legend box?
  3. How to remove only the border of the box of the legend?

When plotting a plot using matplotlib:

How to remove the box of the legend?

plt.legend(frameon=False)

How to change the color of the border of the legend box?

leg = plt.legend()
leg.get_frame().set_edgecolor('b')

How to remove only the border of the box of the legend?

leg = plt.legend()
leg.get_frame().set_linewidth(0.0)

For the matplotlib object oriented approach:

axes.legend(frameon=False)

leg = axes.legend()
leg.get_frame().set_edgecolor('b')
leg.get_frame().set_linewidth(0.0)

One more related question, since it took me forever to find the answer:

How to make the legend background blank (i.e. transparent, not white):

legend = plt.legend()
legend.get_frame().set_facecolor('none')

Warning, you want 'none' (the string). None means the default color instead.